Pump



Dec. 24, 1929. c. A. ROBERTS 1,740,523

PUMP

Original Filed July 18, 1927 2 Sheets-Sheet 1 A TTORNE Dec. 24, 1929.

PUMP

Original Filed July 18, 192' 2 Sheets-Sheet 2 1 NV EN TOR,

/""" M,M MM

F ATTORNEYJ.

c. A. ROBERTS 1,740,523

as? i CLARENCE A. RQBER-TS, OF LAKEWOOD, OHIO PUMP Application filed July 1%, 1927, Serial This invention pertains to an improved pump of the reciprocating type, and its objects are to provide a pump of this nature that is highly e'l'lieicnt, substantial, and durable,

and wherein tie flow of fluid through the pump is pr cti 'ally continuous, thereby to render the pump capable of operating easily and quietly at'relatively high speed; to pro vide, in a. pump of the aforesaid type, valves which open and close part illy by inertia thereby insuring easy valve action; and to locate the stuffing box or gland for preventing leakage about the pump rod on the suction side of the pump whereby only sufiicient tightness of the same is required to obviate leakage against sub-atmospheric pressure so as to afford free action of the rod. A further object is to so design the pump that, when disposed in a vertical position, an air space or chamber is provided, the air in which serves to cushion the liquid on the discharge side of the pump and thus avoid perceptible pulsatious in the discharge column.

Further and more specific objects, relating in most partto structural features, will become apparent this description proceeds, reference being had to the accompanying drawings wherein like reference characters designate cori vending parts throughout the several views.

in the drawings, F 1

l shows my improved pump partly in central vertical section and partly in elevation; Fig. 2 is a transverse section on the lines E22 of Figs. 1 and 3; Fig. 3 is central vertical section through the pump; Fig. i is a transverse section on the correspondiiigly numbered line of Fig. 3; and Figs. 5 and 6 are enlarged sectional details showing the manner of mounting the spring seat the outlet valve on the pump body.

According to the present embodiment of the invention, the pump is comprised of a cylindrical casino 1 which has adjacent its lower end diametrically opposed ingress and egress ports 2 and 3, respectively. A partition. ldivides the casing into inlet and outlet sides wherewith the respective ports 2 and 3 communicate, and shown as formed integral with and entendii'ig through said partition is a sleeve 5 whose axis is coincident with that No. 206,504. Renewed May 22, 1929.

of the casing. An enlarged opening in the end wall of the casing adjacent the partition a is closed by a up 6, and applied to the 0pposite open end of the casing is a head 7 having a reentrant portion or extension 8 that depends a suitable distance into the casing and has an. end wall that is formed with a dome 9. Surrounding the extension 8 is an annular space 10.

Arranged to reciprocate within the casing is a hollow pump body that is designated generally by the reference numeral 11. This body is an integral structure formed at its upper end to provide a relatively large sleeve 12 that encircles the extension 8 of the casing head 7, and at its lower end to constitute a tubular extension 13 that fits within the sleeve 5. The extensions 8 and 13 have grooves containing packing rings 8 and 13, respectively, which. co-act with the inner surfaces of the respective sleeves 12 and 5 to effect fluid tight joints therewith. The top of the extension 13 is flatand constitutes a valve seat 1%, and supported centrally within the upper end of said extension, by webs 15, is a hub 16 having a bore through which the reduced upper end 17 of a pump rod 18 extends. Applied to the end of the rod 1'? above the hub 16 are a bushing 18 and a spring seat 19 that are held clamped in place by a nut 20 that screwed on the upper threaded end of the rod. The lower end of the bushing 18 is shown as set within a recess in the adjacent end of the hub 16. To obviate any obstruction to the flow of liquid upwardly through the extension, the portion of the rod immediately below the hub 16 is gradually enlarged upwardly so that its surface merges with the correspondingly tapered surface of the hub 16. An annular valve 21which, by reason of its function, I shall term the inlet valvesu "rounds the bushing 18 and is adapted to be yieldingly held against the seat- 14: by a spring that is compr ssed between the spring seat 19 and the central portion of the valve 21 immediately outside a spring positioning flange 23 thereof. T he spring seat 19 is flared downwardly and outwardly to form a stop for the valve 21 an d to serve as deflector for the liquid.

The portion of the pump body constituting the sleeve 12 extends a suitable distance downwardly over and is concentric with the upper end of the portion forming the extension 13 and the two portions are fastened together and spaced apart by a plurality of webs 24. The lower edge of the sleeve 12 is made flat and in the plane of a flat shoulder that surrounds the adjacent end of the extension 13 and the two constitute a valve seat 25 with which an annular outletvalve 26 cooperates 'lhis valve is yieldingly maintained against said seat by a spring 2. that is compressed between the valve outside its spring positioning 28, and a spring seat 29 that is carried by the extension 13 a suitable distance below the valve seat 25. As an economical and convenient means of attaching the spring seat 29 to the pump body I provide a collar 30 that is made up of two or more sections that are assembled end to end within a groove 31 of the body, L fter the valve 26, spring 27 and sprin seat 29 have been slipped over the extension 13 in the order named. After the collar has been thus placed within said groove the spring is permitted to relax so that the spring will force the spring seat downwardly until its rabbeted lower edge embraces the flange 32 of the collar. The spring seat 29 is flared upwardly and outwardly to form a stop for the valve 26.

The rod 18 operates through a central aperture in the cap 6 and the latter is counterbored around said aperture to provide a re cess for packing material 35 that is compressed by a gland 3'7 shown as clamped in place by a nut 38 applied to a stud 39 that projects from the cap 6.

In considering the operation of the pump it may be assumed that suitable supply and discharge conduits are connected to the easing in communication with respective ingress and egress ports 2 and 3 and that fluid is present therein and within the pump, filling the same practically completely excepting the space 10 within the head 7 which, when the pump is used in a vertical position, is occupied by air. When the pump body is moved upwardly by means of the rod 18, as indicated by the arrow in Fig. 1, fluid will be drawn in through the ingress port 2, and the fluid that is present within the pumping chamber designated A will be forced past the outlet valve 26, the spring 27 yielding to the superior pressure of the fluid within the chamher A. The fluid thus discharged from said chamber into the outlet side B of the casing will displace a corresponding quantity of fluid from said outlet side through the egress port 3. The air present in the space 10 acts to cushion the liquid on the outlet side of the pump and thus prevents perceptible pulsations occurring in the discharge column.

Upon the down stroke of the pump body the parts will assume the positions illustrated in Fig. 3, the valve 26 resuming its seat partially through its inertia, partially under the influence of the spring 27 and partially because of the suction created within the pumping chamber A, and due to the latter cause, plus inertia, the inlet valve 21 will be opened against the tension of its spring and a fresh supply of fluid will be drawn into the chamber A. Also during its descending stroke, the pump body will displace a further quantity of fluid from the outlet side B of the casing through the egress port 3. In other words, during each stroke of the pump body in either direction fluid is discharged from the port 3, while a quantity is drawn in through the port 2.

Thus it will be seen that my improved pump operates to effect a substantially continuous flow of fluid, and the inertia of the fluid created by this continuous pumping action will assist the flow through the pump, rendering the operation of the pump relatively easy and quiet and will contribute to a free action of the valves 21 and 26, it being apparent from the foregoing description that the opening and closing of both valves is assisted by the inertia of the valves.

My improved pump lends itself readily to an installation wherein two or more of the pumps are arranged in multiple. In such a case, theingress ports of the pumps are connected to a common inlet manifold, and the egress ports to a discharge manifold, all of which will be readily understood. Because this arrangement is such an obvious one, illustration thereof is deemed unnecessary.

Because of its low clearancewhich refers to the very small volume of the pumping chamber at the end of the exhaust strol;e the pump is peculiarly suited to the pumping of volatile liquids, or liquids containing gas or air.

Having thus described my invention, what I claim is I 1. A pump of the character set forth comprising a casing having an ingress and an egress port opening respectively into the inlet and outlet sides of the casing and a passage way through which said sides of the casing communicate, the casing having also a reentrant portion spaced longitudinally of the casing from said passageway, a hollow pump body having a part slidably fitting within said passageway and another part similarly tting about the said reentrant portion of the casing and constituting therewith a pumping chamber, valves permitting the flow of fluid from the inlet side of the casing through the first mentioned part of the body into the pumping chamber and the flow of fluid from said chamber into the outlet side of the casing, both valves preventing reverse flow, and means for reciprocating the body.

2. A pump of the character set forth comprising a casing having an ingress and an egress port opening respectively into the inlet and outlet sides oi" the casing and a passageway through which said sides 01 the casing communicate a hollow pump body having a part slidably fitting within said passageway and another part similarly fitting a part of the casing and constituting therewith a. pumping chamber, said part of the casing being surrounded by a compartment wherein the surrounding side of the pump body reciprocates, valves permitting the flow of fluid from the inlet side of the casing through the first mentioned part of the body into the pumping chamber and the flow of fluid from said chamber into the outlet side of the casing, said valves preventing reverse flow, and means for reciprocating the body.

3. A pump of the character set forth comprising .a casing having an ingress and egress port, a partition dividing the casing into an inlet and an outlet side wherewith said ports eon'in'iunicate, respectively, said partition having a passageway while the casing is provided with a reentraut portion spaced axia ly from said passageway, a hollow pump body having a part slidably fitting within said pr sageway and another part similarly fitting about said reentrant portion of the casing and constituting therewith a pumping chamber, the inlet and outlet sides of the casing communicating through said body,-vaives permitting the flow of fluid from the inlet side of the casing through the first mentioned part ot the body into the pumping chamber and the fiow of fluid from said chamber into the outlet side of the casing, said valves preventing reverse fiow, and means for reciproxating the body.

l. pump of the character set forth comprising a casing having an ingress and an egress port, a partition dividing the easing into an inlet and an outlet side wherewith said ports communicate, respectively, said partition having a passageway while the cas ing provided with a reentrant portion spaced axially from said passageway, a hollow pump body having a part slidably fitting with said passageway and another part similarly fitting about said reentrant portion of the casing and constituting therewith a pumping chamber, the inlet and outlet sides of the casing communicating through said body, valves permitting the fiow of fluid "from the inlet side of the casing through the first mentioned part of the body into the pumping chamber and the flow of fluid from said chamber into the outlet side of the casing, said valves preventing reverse flow. a rod connected to the body for reciprocating the same and extending through an aperture in the wall of the casing on the inlet side thereof, and a stufiing gland for effecting a fluid tight joint between the rod and said wall.

5. A pump of the character set forth comprising a casing having an ingress and an egress port, a partition dividing the easing into an inlet and an outlet side wherewith said ports communicate, respectively, a sleeve opening through said partition, the casing having an internal extension spaced axially from the sleeve, a hollow pump body having an extension slidably fitting within said sleeve, the body incorporating also a sleeve similarly fitting said extension of the casing and constituting therewith a pumping chamber, the inlet and outlet sides of the casing communicating through the pump body, valves permitting the flow of fiuid from the inlet side of the casing through the extension of the pump body into the pumping chamber and the flow of fluid from said chamber into the outlet side of the casing, said valves preventing reverse flow, and means for reciprocating the body.

6. A. pump of the character set forth comprising a casing having an ingress and an egress port, a partition dividing the easing into an inlet and an outlet side wherewith said ports communicate, respectively, a sleeve incorporated within and extending through the partition and disposed adjacent one end or the casing, a piston like extension projecting into the opposite end of the casing substantially in axial alignment with the sleeve, a hollow pump body having at one end a tubular piston-like extension reciprocable within said sleeve and at its opposite end a sleeve slidable upon the first mentiioned extension and constituting therewith a pumping chamber, said body incorporating ports through which communication is established between the inlet and the outlet sides 01 the casing, valves for controlling the flow of fluid through said ports and so constituted and arranged as to permit the flow of fluid from the inlet side of the casing through the extension of the pump body into the pumping chamber and from said pumping cliamber into the outlet side of the casing, said valves preventing reverse flow, and means for reciprocating the pump body.

In testimony whereof, I hereunto aiiix my signature.

CLARENCE A. ROBERTS.

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